Conflation of computational fluid dynamics(CFD) and building energy simulation (BES)has been used in recent years in order toimprove the estimation of surface coefficientsfor studies on thermal comfort, mold growthand other performance aspects of a building.BES can provide more realistic boundaryconditions for CFD, while CFD can providehigher resolution modelling of flow patternswithin air volumes and convective heat transfercoefficients (CHTC) for BES. BES and CFDcan be internally or externally coupled.

This paper investigates the thermal effect of ceiling-mounted light fixtures for a displacement ventilation system. The influence of fluorescent lainps on a ceiling is examined by computational fluid dynamics and experimental methods. The test room is a 5.3m X 5.44m X 2.5m height office. Two supply air diffusers and two exhaust grilles are dimensioned bv 0.9m x 0.2ni each. A heat source is instailed at the center of the room. Supply air velocity is treated as a parameter from 0.1 to 0.5 mls. The finite volume method and low-Reynolds number k- ?

A com~nonp ractice, adopted by several buildingenergy simulation (BES) tools, is the use ofsurface averaged wind pressure coefficients (Cp)instead of local Cp values with high resolutionin space. The aim of this paper is to assess theuncertainty related to the use of surfaceaveraged data, for the case of a cubic buildingwith two openings. The focus is on wind-drivenventilation and infiltration, while buoyancy isnot taken into account.

In the past various experimental investigationsabout room airflows were published. But mostinvestigations are limited regardingmeasurement positions (restricted flow pattern)and the availability of turbulent quantities(Reynolds-Stresses, entrainment, macroscopicinstabilities etc.). Based on the availableexperimental data a targeted improvement ofturbulence models is difficult. Therefore twodifferent room airflow situations wereinvestigated with three-dimensional ParticleImage Velocimetry. Detailed information of theflow, the Reynolds-stress distribution and theentrainment are presented.

It is well known that the turbulence anisotropyhas a remarkable influence on the flow of threedimensional wall jets. So the accuratesimulation of room airflows with air suppliesmounted just below the ceiling requires a highlevelturbulence closure.Therefore in this paper the potential for theimprovement of room airflow prediction byusing different Reynolds stress models and anew nonlinear eddy viscosity turbulence modelare discussed.

An investigation to understand the actual conditionsof smoking spaces was conducted, and itbecame clear that the introduction of a highlyefficientventilation system is necessary, in additionto the securing of a sufficient ventilationvolume. In addition, case studies using CFD andexperiments were conducted on the effects ofintroducing a highly-efficient ventilation systemto smoking rooms.

Honda Wako Building(hereinafter called HWB)" is ahigh efficiency saving energyoffice building with six floorshaving 52,138-m2 of total floorarea. Honda Motor Co., Ltd(hereinafter called HondaMotor) required reducing 50 %of emission of life cycle CO2 ascompared with a standardbuilding at the design stage. Torealize energy saving building,the architectural plan has twodistinguishing characteristics.Firstly, both of whole ofsouth and north of facadeconsist of low-e coating glassesand aluminum panels.

This paper presents a design method to definethe settings of HVAC systems in order toprovide thermal comfort in high MRTenvironment in hot climates. The method,firstly, discuss the use of simplified thermalload calculation methods, in face of thespecificities of the theme. Then, dynamic heat,air and moisture envelope simulations areperformed in order to define the surfaces'internal temperatures. The distribution system,including terminal sizing and positioning, flowrate and temperature, is defined based on CFDsimulations.

In this study, field measurements andinvestigations have been carried out tounderstand the energy consumption and indoorenvironment of a sustainable designed officebuilding. The office building is located in thenorth of Sendai City, northeast area of HonshuIsland, Japan. It was completed in June 2006and covers an area of 4090 m2. The building isconstructed in wood so as to reduce thegeneration of C02.

Translucent thermal insulation walls forJapanese houses have been designed to allowsolar radiation and daylight to pass through thewalls into the house (Fig. 1) in order to reducethe amount of energy required for heating andlighting and to create a comfortable lightingenvironment. The walls are made of translucentor transparent materials such as glass andthermal insulation material.The walls have been developed withconsideration given to conditions of variousregional climates and housing lots.